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Audi
,
A6
,
C4
, 2.8
(1994-)
Common Issues
Overview
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Common Issues
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Oil leaks from valve cover gasket
Faulty oxygen sensors (O2S) - intermittent or permanent failure
Worn-out cambelt ( timing belt ) - breaking or slipping
Rear main seal leak
Coolant leaks from radiator, hoses, or water pump
Faulty idle control valve (ICV)
PCV system clogged or faulty
Brake issues - worn brake pads, warped rotors, or caliper problems
Air conditioning system failure - low pressure, leaks, or compressor problems
Fuel injector clog or faulty
Ignition coil failure
Crankshaft and camshaft bearing wear
DSC (Electronic Stability Control) system malfunction
ABS system problems - faulty sensors or pumps
Clutch master cylinder failure (for manual transmissions)
Gearbox issues - slipping, hard engagement, or linkage problems (for automatic transmissions)
Rear differential seal leak
Power steering pump and rack problems
Faulty EGR valve
Intermittent starting problems due to ignition coil, crankshaft position sensor, or fuel injector faults
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